The correct answer is A.

AgilePM values estimation, but it also values proportionality. Estimating should help planning and decision-making, not become a heavy exercise that delays progress and creates unnecessary documentation.

Why A is correct:

Estimates should be accurate enough for the planning purpose at hand.

Teams should avoid excessive refinement when the extra effort gives little added value.

AgilePM encourages ''just enough'' detail, not exhaustive analysis.

This question highlights a common anti-pattern:

too much time spent estimating,

too much documentation,

and too little focus on actual delivery.

Why the other options are incorrect:

B is incorrect because trying to eliminate all uncertainty is unrealistic and contrary to AgilePM thinking.

C is incorrect because although early estimates may be broad, refinement is still useful later when more information becomes available.

D is incorrect because documenting every assumption in detail is excessive and not agile.

So the best answer is A.